M4 Stock help!

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I'm having a hard time finding this information, so I thought I'd ask here.

When I build my M4, I want it to be adaptable, by which I mean I want to be able to modify it slightly for different missions due to my preferred playing style, at the moment, I want two stocks for this purpose.

The first one is going to be a long/retractable stock (either/or), one of these two:

What tube lengths do I need for these? I presume the folders use the short buffer, whereas the others use a long buffer (I'm hoping the G&G also uses short, but feel it unlikely based on it's size)? If this is the case, can anyone suggest replacement stocks so that I can fit both onto one body?